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SP491E Datasheet(PDF) 7 Page - Exar Corporation |
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SP491E Datasheet(HTML) 7 Page - Exar Corporation |
7 / 12 page 7 Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-707 • www.exar.com SP490E,49E_0_05243 DESCRIPTION T h e S P 4 9 0 E a n d S P 4 9 1 E a r e full-duplex differential transceiv- ers that meet the requirements of RS-485 and RS-422. Fabricated with a Exar proprietary BiCMOS process, both products require a fraction of the power of older bi- polar designs. The RS-485 standard is ideal for multi-drop applications or for long-distance interfaces. RS-485 allows up to 32 drivers and 32 receivers to be connected to a data bus, making it an ideal choice for multi-drop applications. Since the cabling can be as long as 4,000 feet, RS-485 transceivers are equipped with a wide (-7V to +2V) com- mon mode range to accommodate ground potential differences. Because RS-485 is a differential interface, data is virtually immune to noise in the transmission line. Driver... Thedriversforboththe SP490EandSP491E have differential outputs. The typical voltage output swing with no load will be 0 volts to +5 volts. With worst case loading of 54Ω across the differential outputs, the driver can maintain greater than .5V voltage levels. The driver of the SP491Ehasadriverenable control line which is active high. A logic high on DE (pin 4) of the SP491E will enable the differential driver outputs. A logic low on DE (pin 4) of the SP491E will tri-state the driver outputs. The SP490E does not have a driver enable. Receiver... The receivers for both the SP490E and SP491E have differential inputs with an input sensitivity as low as ±200mV. Input impedance of the receivers is typically 15kΩ (12kΩ minimum). A wide common mode range of -7V to +2V allows for large ground potential differences be- tween systems. The receivers for both the SP490E and SP491E are equipped with the fail-safe feature. Fail-safe guarantees that the receiver output will be in a high state when the input is left unconnected. The receiver of the SP491E has a receiver enable control line which is active low.Alogic low on REB (pin 3) of the SP491E will enable the differential receiver. A logic high on REB (pin 3) of the SP491E will tri-state the re- ceiver. |
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